{"id":200533,"date":"2025-05-06T09:37:52","date_gmt":"2025-05-06T01:37:52","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200533\/"},"modified":"2025-05-06T09:37:52","modified_gmt":"2025-05-06T01:37:52","slug":"%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e7%bb%9f%e8%ae%a1%e5%ae%8c%e6%88%90%e6%89%80%e6%9c%89%e7%89%b9%e5%ae%9a%e4%bb%bb%e5%8a%a1%e7%9a%84%e7%94%a8%e6%88%b7%e6%95%b0%e9%87%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200533\/","title":{"rendered":"\u5982\u4f55\u9ad8\u6548\u7edf\u8ba1\u5b8c\u6210\u6240\u6709\u7279\u5b9a\u4efb\u52a1\u7684\u7528\u6237\u6570\u91cf\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u9ad8\u6548\u7edf\u8ba1\u5b8c\u6210\u6240\u6709\u7279\u5b9a\u4efb\u52a1\u7684\u7528\u6237\u6570\u91cf\uff1f<\/h1>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241107\/1730986246672cc1066d47a.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u4f18\u5316sql\u67e5\u8be2\uff1a\u67e5\u8be2\u7279\u5b9a\u4efb\u52a1\u5b8c\u6210\u7684\u7528\u6237<\/strong><\/p>\n<p>\u5bf9\u4e8e\u4e00\u4e2a\u62e5\u6709\u4efb\u52a1\u8fdb\u5ea6\u8868\u7684\u6570\u636e\u96c6\uff0c\u6b64\u8868\u8ddf\u8e2a\u5355\u4e2a\u7528\u6237\u7684\u4efb\u52a1\u5b8c\u6210\u72b6\u6001\uff0c\u5176\u4e2d\u4efb\u52a1\u4ec5\u9650\u4e8e 1\u30012 \u548c 3\u3002\u4e3a\u4e86\u9ad8\u6548\u5730\u786e\u5b9a\u5b8c\u6210\u6240\u6709\u4e09\u4e2a\u4efb\u52a1\u7684\u7528\u6237\u6570\u91cf\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u4f18\u5316\u67e5\u8be2\uff1a<\/p>\n<pre>select user_id from test where status=1 group by user_id having count(*)=3<\/pre>\n<p>\u6b64\u67e5\u8be2\u91c7\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li><strong>\u7b5b\u9009\u5b8c\u6210\u7684\u4efb\u52a1\uff1a<\/strong>where status=1 \u9009\u62e9\u6240\u6709\u72b6\u6001\u4e3a 1\uff08\u5df2\u5b8c\u6210\uff09\u7684\u4efb\u52a1\u3002<\/li>\n<li><strong>\u6309\u7528\u6237\u5206\u7ec4\uff1a<\/strong>group by user_id \u5c06\u7ed3\u679c\u6309\u7528\u6237 id \u5206\u7ec4\uff0c\u5c06\u76f8\u540c\u7528\u6237\u7684\u4efb\u52a1\u5206\u7ec4\u5728\u4e00\u8d77\u3002<\/li>\n<li><strong>\u8ba1\u7b97\u6bcf\u4e2a\u7528\u6237\u7684\u5b8c\u6210\u4efb\u52a1\u6570\uff1a<\/strong>count(*) \u8ba1\u7b97\u6bcf\u4e2a\u7528\u6237\u7ec4\u4e2d\u5b8c\u6210\u7684\u4efb\u52a1\u6570\u3002<\/li>\n<li><strong>\u7b5b\u9009\u5b8c\u6210\u6240\u6709\u4efb\u52a1\u7684\u7528\u6237\uff1a<\/strong>having count(*)=3 \u7b5b\u9009\u53ea\u5b8c\u6210\u6240\u6709\u4e09\u4e2a\u4efb\u52a1\u7684\u7528\u6237\u7ec4\uff0c\u5373\u5b8c\u6210\u7684\u4efb\u52a1\u6570\u7b49\u4e8e 3 \u7684\u7ec4\u3002<\/li>\n<\/ol>\n<p>\u901a\u8fc7\u6267\u884c\u6b64\u67e5\u8be2\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u786e\u5b9a\u5b8c\u6210\u6240\u6709\u4e09\u4e2a\u4efb\u52a1\u7684\u7528\u6237\u6570\u91cf\uff0c\u4f18\u5316\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff0c\u5176\u4e2d n \u662f\u8868\u4e2d\u7684\u884c\u6570\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u9ad8\u6548\u7edf\u8ba1\u5b8c\u6210\u6240\u6709\u7279\u5b9a\u4efb\u52a1\u7684\u7528\u6237\u6570\u91cf\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u9ad8\u6548\u7edf\u8ba1\u5b8c\u6210\u6240\u6709\u7279\u5b9a\u4efb\u52a1\u7684\u7528&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200533","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200533"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200533\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}